Multi-Wavelength Encoding for Photonic Packet Switching
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Solution Overview
Problem
Current data center communication systems face challenges with packet loss and increased complexity due to high data throughput, prompting a need for alternative methods beyond electrical packet switching.
Innovation Solution
A system and method for multi-wavelength encoding using a packet address reader, wavelength generators, optical modulators, an inverse multiplexer, and optical amplifiers to encode and decode packet addresses, enabling efficient photonic packet switching by selecting and modulating optical carriers based on address symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical packet switches with inter-stage buffering are used to route data packets, then packet routing capability is achieved, but packet loss occurs due to buffering overflow and system complexity increases
Solution Approach 1:
The patent replaces electrical packet switching with photonic packet switching. Optical packets are switched directly in the optical domain using wavelength labels for routing, eliminating the need for electrical conversion and inter-stage buffering. This substitution of electrical systems with photonic systems resolves the packet loss issue while maintaining routing capability without increasing complexity.
Solution Approach 2:
The patent changes the fundamental parameter of signal domain from electrical to optical. By encoding packet addresses as wavelength labels and performing switching operations in the optical domain, the system achieves packet routing without electrical buffering, thereby eliminating overflow-related packet loss and reducing overall system complexity.
2Device complexity
If photonic packet switching is implemented to reduce complexity, then alternative routing approach is achieved, but implementation difficulty arises
Solution Approach 1:
The patent segments the packet address into multiple wavelength labels, where each wavelength represents a segment of the address information. This segmentation allows for simplified optical switching operations compared to handling complete addresses, making photonic packet switching more implementable while reducing overall system complexity.
Solution Approach 2:
The patent introduces wavelength labels as intermediary elements that carry address information. These wavelength labels serve as mediators between the optical packet and the switching fabric, enabling photonic switching operations to be performed more easily without requiring complex direct address handling, thus reducing implementation difficulty.
3Loss of information
If multiple wavelength labels are used for encoding packet addresses, then routing information capacity increases, but encoding complexity increases
Solution Approach 1:
The packet address is segmented into multiple wavelength labels, with each wavelength carrying a portion of the routing information. This segmentation increases the total routing information capacity that can be encoded in the optical domain, while the modular nature of wavelength assignment simplifies the encoding process compared to handling entire addresses as single units.
Solution Approach 2:
The wavelength labels serve multiple functions: they carry address information, enable optical switching, and provide routing guidance through the photonic network. This multi-functionality increases routing information capacity while the standardized wavelength assignment protocol reduces encoding complexity by providing a universal framework.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces packet loss and increases data center efficiency by allowing for high-speed, low-error optical packet routing with reduced complexity and cost, leveraging photonic switches to manage massive data flows effectively.
Implementation Method 1
Modulating, by each optical modulator, an optical carrier with a corresponding packet fragment
Implementation Method 2
Amplifying, by the first optical amplifier, a combination of all output signals of all optical modulators
Data Source
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AI summary
In one embodiment, a method for multi-wavelength encoding includes receiving an input optical packet stream having an address and data and encoding the address of the input optical packet stream producing an encoded address including a first group of symbols including a first selected symbol, where the first group of symbols has more than two symbols. The method also includes generating a first wavelength in accordance with the first selected symbol and generating an output optical packet stream having the data of the input optical packet and the first wavelength, where the first wavelength corresponds to the first selected symbol. Additionally, the method includes modulating the first wavelength with the input optical packet stream.